Hi all,
i just wondered how the camera interface's, especially the previewer
module's CFA coefficients are setup on OMAP3530.
The TRM also does not give too much information about it:
In the generic mode, CFA interpolation is implemented using
programmable filter coefficients that operate
on a 5x5 grid:
· Each coefficient is coded in S8Q6 format.
· Each output color , G, and B) has its own set of coefficients.
· There are 4 phases. Each pixel is associated with a phase.
· Different sets of filter coefficients are provided, depending on the
tendency (gradient in the data:
horizontal, vertical, or neutral).
· So there are 3 color x 4 phase x 3 tendencies x 16 taps = 576
coefficients (each coefficient is 8 bits
wide).
Note: Coefficients are based on sensor type. However, users can use a
different methods of
defining an optimal coefficient set.
Also drivers/media/video/isp/cfa_coef_table.h does not provide
information on what the inserted values mean and how they are arrenged.
My question now is: is there anyone on the list who would provide me
with information on how to compose these coefficients correctly?
Thank you very much,
Matthias
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